Deploy guidelines

I agree with removing the need for SSH, but I don't like that solution. It increases the chance for someone to mess up the .env file, and forces you to have your copy up-to-date, which will involve asking someone for it, or use SSH to get it. So in the end it might actually be worse, and error prone

I already made a possible a few months ago: https://github.com/naps62/capistrano3-env
But I have to confirm that it still works